Control system and method for preventing direct current blocking based on transient energy method

Abstract

The invention relates to a control system and method for preventing direct-current blocking based on a transient energy method, belongs to the technical field of power systems, and solves the problemsthat in the prior art, the transient stability performance adjustment speed of a power system is low, and the provided fault removal time is short. The system comprises a data acquisition module usedfor acquiring electrical data of the multi-machine power system containing the HVDC when the multi-machine power system fails; a system transient disturbed trajectory prediction module used for predicting the rotor angle and the rotor angular speed of the generator after the fault according to the electrical data during the fault; a system transient energy stability domain estimation module usedfor obtaining the transient energy stability margin of the multi-machine power system; and a transient stability direct-current additional controller which carries out self-adaptive control over the multi-machine power system according to the transient energy stability margin and the target transient energy stability margin when it is judged that the multi-machine power system breaks down. The system can provide sufficient time to ensure that system faults are removed under the condition that system direct current is not locked, and safe and stable operation of the system is maintained.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a control system and method for preventing direct current blocking based on a transient energy method. Background technique [0002] my country's high-voltage direct current transmission line has a large transmission power and plays an extremely important role in energy transfer and distribution. my country's AC and direct current power system presents a "strong direct and weak alternating current" form. The DC blocking of the HVDC transmission line leads to the redistribution of the AC line flow, which has a great impact on the safe and stable operation of the power system. It will not only cause a large amount of power load loss, but may further induce system chain safety accidents. Therefore, the adoption of DC blocking measures in the AC-DC interconnection system must be cautious. [0003] The DC line has the ability of fast transient regulation, and it is an effective...

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a control system and method for preventing DC blocking based on the transient energy method, in order to solve the problem of slow speed of system transient stability regulation and poor DC blocking control by the power system control strategy in the prior art. exact question

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